All platforms: Normally we don't feature individual widgets that require downloading a separate engine to run them, but the Informer Yahoo Widget might be worth the effort. Place system monitoring tools right on your desktop with Informer, like Wi-Fi signal strength, system uptime, and disk use. Keep tabs on your favorite web site feeds and inboxes with RSS and email notifications for Yahoo Mail, Gmail, and any other POP or IMAP account. Add shortcuts to local folders, favorite web sites and images as well with Informer. Check out Cybernet News' walkthrough of what you can do with this full-featured widget, which is a free download for Mac or Windows and requires the Yahoo Widget Engine to run.